Derivatives and Hedging - Offsetting of financial assets and derivatives assets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Current Assets
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 6	$ 15
Net amounts of assets presented in the statement of financial position	4	6
Other Noncurrent Assets
Derivative [Line Items]
Gross Amounts of Recognized Assets	9	17
Net amounts of assets presented in the statement of financial position	9	13
Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Gross Amounts of Recognized Assets	14	32
Gross Amounts Offset in the Statement of Financial Position	(1)	(13)
Net amounts of assets presented in the statement of financial position	13	19
Not Designated as Hedging Instrument
Derivative [Line Items]
Gross Amounts of Recognized Assets	15	32
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 1	$ 0